function ValidateForm(f){

      with(f){
         
         if (isEmpty(email.value)) {
            alert("Please enter your Email Address");
            email.focus();
            return false;
         }

         if ( !isEmail(email.value) ) {
            alert("Please enter a valid Email Address.");
            email.focus();
            return false;
         }

		 
   	}
   return true;
 }